EXPLAINING THE PROBLEM: Let's say that one of your categories is food > pizza. The main URL will be: www.example.com/products/food/pizza/ If you try to replace "food" with anything else, it will work anyway (try on yourself with your own site!)The result is that you will get a lot of duplicated content: several pages with different URLs but same data. FIXING IT: This plugin automatically improves WooCommerce URL structure for product categories/subcategories, removing (redirecting) duplicated contents. If you go to: www.example.com/products/a-random-word/pizza/ You will be automatically redirected to: www.example.com/products/food/pizza/ (the main, unique, "official" and canonical URL).